内蒙古白音诺尔铅锌矿床南矿带微量元素地球化学特征及找矿指示

Geochemical characteristics of trace elements and prospecting indication in the south ore belt of Baiyinnuoer Pb-Zn deposit,Inner Mongolia

在白音诺尔矿区开展微量元素地球化学找矿工作,共采集白音诺尔铅锌矿南矿带650中段地层和构造蚀变岩样品119件,分析测试微量元素20种。微量元素含量特征显示,白音诺尔铅锌矿床南矿带地层、岩体和脉岩中Pb、Ag、Cu、As、Mo、Sb、Bi元素参与了成矿作用,它们在热液蚀变过程被带进或带出,维持了元素在成矿过程中的化学平衡。在成矿热液蚀变过程中,Pb、Zn、Ag、Sb、Bi、Sn、Mn元素参与了蚀变成矿作用。主成矿元素Pb、Zn在平面上分布特征比较相似,高值区主要分布于南西部,向南西延伸均未封闭,显示铅锌矿化向南西方向延伸可能仍具有较大潜力。通过本次研究并结合前人的研究成果认为,成矿流体可能来源于南西深部,从侧面反映了深部矿体存在的可能性,预示着南西深部可能具有较好的找矿潜力。

Based on the geochemical prospecting of trace elements in Baiyinnuoer mining area,119 samples of the strata and structural altered rocks at the middle section of 650 in the south ore belt of Baiyinnuoer Pb-Zn deposit are collected,and 20 trace elements are analyzed and tested.The trace element content characteristics show that Pb,Ag,Cu,As,Mo,Sb,Bi elements of the strata,rock bodies and dykes in the south ore belt of Baiyinnuoer Pb-Zn deposit have participated in the mineralization,and they are brought in or out during the hydrothermal alteration process,maintaining the chemical balance of elements during the mineralization.In the process of hydrothermal alteration,Pb,Zn,Ag,Sb,Bi,Sn and Mn have participated in the alteration mineralization.The main ore-forming element Pb and Zn have similar distribution characteristics on the plane,and the high-value areas are mainly distributed in the south-west and the south-west extension is not closed,which indicates that the lead-zinc mineralization may still have a great potential in the south-west extension.Based on this study and previous research results,it is believed that the ore-forming fluids may originate from the deep part of south-west,which laterally reflects the possibility of deep ore bodies and indicates that there is certainly an ore-prospecting potential in the deep part of south-west.